Recording medium with a linking area including a synch pattern thereon and apparatus and methods for forming, recording, and reproducing the recording medium

ABSTRACT

A recording medium, such as a high-density and/or read-only recording medium including a data area including at least two data sections and a linking area to link neighboring data sections, the linking area including at least two frame sync signals, where values of the at least two frame sync signals maintain uniqueness, and to methods and apparatuses for forming, recording, and reproducing the recording medium.

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This U.S. non-provisional application is a continuation-in-partof PCT International Application No. PCT/KR03/01096, filed on Jun. 4,2003, the entire contents of which are incorporated by reference, whichfurther claims priority of Korean Patent Application No. 2002-037146,filed on Jun. 5, 2002; Korean Patent Application No. 2002-067955, filedon Nov. 4, 2002; Korean Patent Application No. 2002-067956, filed onNov. 4, 2002; Korean Patent Application No. 2002-077093, filed on Dec.5, 2002; Korean Patent Application No. 2002-077094, filed on Dec. 5,2002; Korean Patent Application No. 2002-079818, filed on Dec. 13, 2002;Korean Patent Application No. 2002-079819, filed on Dec. 13, 2002; andKorean Patent Application No. 2003-001858, filed on Jan. 11, 2003; allin the Korean Intellectual Property Office, the entire contents of whichare hereby incorporated by reference.

TECHNICAL FIELD

[0002] The present invention relates to a synch pattern of a linkingarea of a recording medium.

BACKGROUND ART

[0003] A disc-type recording medium such as a compact disc (CD) canpermanently store high-quality digital audio data, which makes such amedium popular. The “digital versatile disc” (referred as ‘DVD’hereinafter) has been developed as a new disc-type recording medium. ADVD can store much more data than a CD, thus, more high-quality movingpicture and/or audio data may be recorded on a DVD, which has enabledwidespread use of the DVD. There are at least three types of DVD,DVD-ROM for read-only, DVD-R for write-once, and rewritable DVD-RAM orDVD-R/W.

[0004] Recently, another rewritable recording medium, called BD-RE(Blu-ray Disc REwritable), larger in storage capacity than a DVD hasbeen introduced.

[0005] As shown in FIG. 1a, a rewritable disc, such as BD-RE includingareas such as a clamping area 1, a transition area 2, a burst cuttingarea (BCA) 3, a lead-in area 4, a data zone, and a lead-out area 5.

[0006] The clamping area 1 is a center area to be clamped by a damper ofa disc device to fix the rotating disc, and the transition area 2 is anarea between the clamping area 1 and the information area including thelead-in area 4 and the data zone. The BCA 3 is used to add informationto the disc after completion of a disc manufacturing process. Thelead-in area 4 may be where important information needed for discreproduction is provided while the lead-out area 5 may be where a discending signal is provided.

[0007] The lead-in area 4 may be subdivided into several areas includinga first guard area 1, a permanent information and control (PIC) area, asecond guard area 2, the second information 2, OPC, a reserved area, andthe first information 1.

[0008] The first guard 1 area is used as a protection area againstoverwriting of the PIC area by the BCA 3. The PIC area is an area wheregeneral information about the disc and various other information hasbeen stored in a pre-recorded groove. The second guard area 2 is used asa buffering area for the changeover from the pre-recorded area to therewritable area, and the first and the second information areas are usedto store specific information about the disc or applications, such ascontrol information.

[0009]FIGS. 1b and 1 c show an exemplary RUB (Recording Unit Block). Asingle RUB, which corresponds to a single ECC (Error Correction Code)block, is composed of Run-in, physical cluster, Run-out, and guardareas, as shown in FIG. 1b. If more than one RUB, for example,successive RUBs, are created at one time to store real-time input data,e.g., A/V data, the set of Run-in, physical and Run-out is repeated asmany times as necessary and a guard area ‘Guard_(—)3′ is formed at theend, as shown in FIG. 1c.

[0010] The Run-in area, as shown in FIG. 2a, may include a1100-channel-bit guard ‘Guard_(—)1’ and a 1660-channel-bit preamble‘PrA’. 55 repetitions of a 20-channel-bit pattern are written in theguard ‘Guard_(—)1’ to indicate the head of an RUB while the first syncdata ‘Sync_(—)1’ and the second sync data ‘Syn_(—)2’, which are 30channel bits in length, are written in the preamble ‘PrA’. Each syncdata is composed of 24-bit sync body and 6-bit sync ID. The sync IDs ofthe first and the second sync data are ‘000 100’(FS4) and ‘010000’(FS6), respectively.

[0011] The Run-out, as shown in FIG. 2b, is composed of a540-channel-bit guard ‘Guard_(—)2’ and a 564-channel-bit post-amble‘PoA’ including the third sync data ‘Sync_(—)3’. The third sync dataalso includes a 24-bit sync body and 6-bit sync ID. The third sync ID is‘000 001’(FS0).

[0012] The guard ‘Guard_(—)2’ is created to prevent overlap betweenpreviously-recorded data and new data to be recorded and may have 27repetitions of a 20-channel-bit pattern to indicate the end of apreviously-recorded area, namely, a just-recorded RUB.

[0013] User data is written in the physical cluster and the user data isrestored to original data by a signal processor that uses a clocksynchronized with sync data written in the Run-in.

[0014]FIG. 1d shows recording format of a physical cluster of a BD-REwhere 31 recording frames (frames #0˜#30) are recorded. Themutually-different 7 frame syncs used for BD-RE (FSs #0 to #6) may bewritten in the 31 recording frames in a unique order, as shown in FIG.1d.

[0015]FIG. 1e shows the types and patterns of frame syncs to be writtenin a physical cluster. As shown in FIG. 1e, a total 7 frame syncs areused and each frame sync is composed of 24-bit sync body and 6-bit syncidentifying pattern which is different among the 7 frame syncs.

[0016] Each RUB, which corresponding to a single ECC block, has physicaladdress information, e.g., an address unit number (AUN) to enable randomaccess of an arbitrary RUB written on a BD-RE. The physical addressinformation is written in a physical cluster of an RUB after modulatedand encoded along with audio/video (A/V) data. An AUN is derived fromphysical sector number (PSN) that has not been actually written on aBD-RE.

[0017] In the case of a write-once or a rewritable disc (DVD-R, -RW,-RAM, +R, +RW), a linking frame is created behind a previously-recordedarea before new data is recorded discontinuous with thepreviously-recorded data. However, a read-only disc, such as DVD-ROM andvideo CD, does not need a linking frame to link two data sectionsbecause it contains completely-recorded data.

[0018] Such a difference between a writable and a read-only discrequires an ordinary disc player, such as a DVD-player or a DVD-ROMdrive, to be equipped with additional hardware and/or software to playback both types of discs.

[0019] A disc device capable of recording/reproducing a writable discshould also be equipped with additional hardware and/or software to playback a read-only disc as well as a writable disc.

[0020] The standard of a high-density read-only recording medium, called‘BD-ROM’, is also under discussion together with the standardization ofa BD-RE. If the physical format of a BD-ROM was the same as BD-RE, adisc player would be able to apply the same reproduction algorithm toboth recording media. In addition, both types of disks should bedistinguishable, as well as, have compatible formats. A suitablesolution to harmonize these contrary conditions has not yet beenprovided.

SUMMARY OF THE INVENTION

[0021] In exemplary embodiments, the present invention is directed to arecording medium, such as a high-density and/or read-only recordingmedium that has the same or similar physical recording format, includinga linking area, in order to improve reproduction compatibility with ahigh-density and/or rewritable recording medium, and to methods andapparatuses for forming, recording, and reproducing the recordingmedium.

[0022] In exemplary embodiments, the present invention is directed to arecording medium, such as a high-density and/or read-only recordingmedium with sync data in a linking area whose bit pattern is differentfrom sync data written in data recording area, and to methods andapparatuses for forming, recording, and reproducing the read-onlyrecording medium.

[0023] In exemplary embodiments, the present invention is directed to arecording medium, such as a high-density and/or read-only recordingmedium with a physical address in a linking area along with a frame syncand to methods and apparatuses for forming, recording, and reproducingthe read-only recording medium.

[0024] In exemplary embodiments, the present invention is directed to arecording medium, such as a high-density and/or read-only recordingmedium with a linking area where scrambled data is written, and tomethods and apparatuses for forming, recording, and reproducing theread-only recording medium.

[0025] In exemplary embodiments, the present invention is directed to arecording medium, such as a high-density and/or read-only recordingmedium with a linking area that includes data scrambled in the same orsimilar manner as main data, and to methods and apparatuses for forming,recording, and reproducing the read-only recording medium.

[0026] In exemplary embodiments, the present invention is directed to arecording medium, such as a high-density and/or read-only recordingmedium with a linking area that includes data scrambled by using valuesderived from physical sectors associated with data frames within aprevious and/or subsequent physical cluster, and to methods andapparatuses for forming, recording, and reproducing the read-onlyrecording medium.

[0027] In exemplary embodiments, the present invention is directed to arecording medium, such as a high-density and/or read-only recordingmedium with dummy data in its linking areas, and to methods andapparatuses for forming, recording, and reproducing the read-onlyrecording medium.

[0028] In exemplary embodiments, the present invention is directed to arecording medium, such as a high-density and/or read-only recordingmedium with a linking area that includes data recorded in aerror-recoverable format, and to methods and apparatuses for forming,recording, and reproducing the read-only recording medium.

[0029] In exemplary embodiments, the present invention is directed to arecording medium, such as a high-density and/or read-only recordingmedium with a linking area in an area corresponding to a run-in and/orrun-out area of a rewritable recording medium, and to methods andapparatuses for forming, recording, and reproducing the read-onlyrecording medium.

[0030] In exemplary embodiments, the present invention is directed to arecording medium, such as a high-density and/or read-only recordingmedium with a linking area that includes a recording frame of desiredsize, and to methods and apparatuses for forming, recording, andreproducing the read-only recording medium.

[0031] In exemplary embodiments, the present invention is directed to arecording medium, such as a high-density and/or read-only recordingmedium with useful information written in the recording frame, and tomethods and apparatuses for forming, recording, and reproducing theread-only recording medium.

[0032] In exemplary embodiments, the present invention is directed to arecording medium, such as a high-density and/or read-only recordingmedium with a linking area between recorded data sections wherein eachlinking area includes at least one sync signal indicative of the linkingarea, and to methods and apparatuses for forming, recording, andreproducing the read-only recording medium.

[0033] In exemplary embodiments, the present invention is directed to arecording medium, such as a high-density and/or read-only recordingmedium with a sync signal written in a linking area which is differentfrom a sync signal written in a data section, and to methods andapparatuses for forming, recording, and reproducing the read-onlyrecording medium.

[0034] In exemplary embodiments, the present invention is directed to arecording medium, such as a high-density and/or read-only recordingmedium with data scrambled by a physical address written before or afterthe linking area, and to methods and apparatuses for forming, recording,and reproducing the read-only recording medium.

[0035] In exemplary embodiments, the present invention is directed to arecording medium, such as a high-density and/or read-only recordingmedium with data scrambled by a frame sync written therein, and tomethods and apparatuses for forming, recording, and reproducing theread-only recording medium.

[0036] In exemplary embodiments, the present invention is directed to arecording medium, such as a high-density and/or read-only recordingmedium with data scrambled by a provided value, and to methods andapparatuses for forming, recording, and reproducing the read-onlyrecording medium.

[0037] In exemplary embodiments, the present invention is directed to arecording medium, such as a high-density and/or read-only recordingmedium with dummy data recorded in a recording frame within a linkingarea, and to methods and apparatuses for forming, recording, andreproducing the read-only recording medium.

[0038] In exemplary embodiments, the present invention is directed to arecording medium, such as a high-density and/or read-only recordingmedium with information indicative of physical address written in arecording frame, and to methods and apparatuses for forming, recording,and reproducing the read-only recording medium.

[0039] In exemplary embodiments, the present invention is directed to arecording medium, such as a high-density and/or read-only recordingmedium with user data written in the form of an error correction code(ECC) block in a recording frame, and to methods and apparatuses forforming, recording, and reproducing the read-only recording medium.

[0040] In exemplary embodiments, the present invention is directed to arecording medium, such as a high-density and/or read-only recordingmedium with data written in a recording frame within the linking area,processed in the same or similar manner as user data in a data frame,and to methods and apparatuses for forming, recording, and reproducingthe read-only recording medium.

[0041] In exemplary embodiments, the present invention is directed to arecording medium, such as a high-density and/or read-only recordingmedium with a defined area, where a recording unit block (RUB) is to bewritten, corresponding to a run-in and run-out area of a rewritablerecording medium, with a defined sized recording frame, and to methodsand apparatuses for forming, recording, and reproducing the read-onlyrecording medium.

[0042] In exemplary embodiments, the present invention is directed to arecording medium, such as a high-density and/or read-only recordingmedium with a defined area, where a RUB is to be written, correspondingto a run-in and run-out area of a rewritable recording medium, withdefined sized recording frame, wherein a frame sync having a unique bitpattern is written in at least one recording frame, and to methods andapparatuses for forming, recording, and reproducing the read-onlyrecording medium.

[0043] In exemplary embodiments, the present invention is directed to arecording medium, such as a high-density and/or read-only recordingmedium with a defined area, where a RUB is to be written, correspondingto a run-in and run-out area of a rewritable recording medium, with adefined sized recording frame, where a frame sync having a unique bitpattern is provided at least twice, and to methods and apparatuses forforming, recording, and reproducing the read-only recording medium.

[0044] In exemplary embodiments, the present invention is directed to arecording medium, such as a high-density and/or read-only recordingmedium with a defined area, where a RUB is to be written, correspondingto a run-in and run-out area of a rewritable recording medium, with adefined sized recording frame, wherein a frame sync having a unique bitpattern is written in at least one recording frame, and to methods andapparatuses for forming, recording, and reproducing the read-onlyrecording medium.

[0045] In an exemplary embodiment, the present invention is directed toa recording medium including a data area including at least two datasections and a linking area to link neighboring data sections, thelinking area including at least two frame sync signals, where values ofthe at least two frame sync signals maintain uniqueness.

[0046] In another exemplary embodiment, the present invention isdirected to a recording medium including a data area of at least twodata sections and a linking area between the data sections, wherein thelinking area includes at least two linking frames, a first linking frameand a second linking frame which each include at least one frame syncsignal, where each frame sync signals maintain uniqueness and isdifferent from a sync signal included in the data section.

[0047] In another exemplary embodiment, the present invention isdirected to a method of forming a recording medium including forming alinking area to link neighboring data sections of a data area whilerecording data onto the recording medium, selecting values of at leasttwo frame sync signals, to maintain uniqueness, and writing the at leasttwo frame sync signals in the linking area to link the neighboring datasections.

[0048] In another exemplary embodiment, the present invention isdirected to a method of reproducing data from a recording mediumincluding utilizing a linking area, including at least two frame syncsignals, which maintain uniqueness and link neighboring data sections ofa data area, to reproduce the data.

[0049] In another exemplary embodiment, the present invention isdirected to a method of recording data on a recording medium includingutilizing a linking area, including at least two frame sync signals,wherein the at least two frame sync signals maintain uniqueness and aredifferent from a sync signal included in the data area, to record thedata.

[0050] In another exemplary embodiment, the present invention isdirected to an apparatus for reproducing data from a recording medium,the apparatus utilizing a linking area, including at least two framesync signals, which maintain uniqueness and link neighboring datasections of a data area, to reproduce the data.

BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The above features and other advantages of the present inventionwill be more clearly understood from the following detailed descriptiontaken in conjunction with the accompanying drawings, in which:

[0052]FIG. 1a shows the structure of a rewritable disc BD-RE (Blu-rayDisc REwritable);

[0053]FIGS. 1b and 1 c show respective formats of a recording unit blockof a BD-RE;

[0054]FIG. 1d shows the structure of a physical cluster of a BD-RE;

[0055]FIG. 1e shows frame syncs used for a BD-RE;

[0056]FIGS. 2a and 2 b show a Run-in and Run-out area, respectively,included in a recording unit block of a BD-RE;

[0057]FIGS. 3a and 3 b show respective formats of a Run-in and Run-outarea formed in a recording unit block of a BD-ROM in accordance with anexemplary embodiment of the present invention;

[0058]FIG. 4a shows a format of a linking area of a BD-ROM in accordancewith another exemplary embodiment of the present invention;

[0059]FIG. 4b shows format of a linking area of a BD-ROM in accordancewith another exemplary embodiment of the present invention;

[0060]FIG. 4c shows format of a linking area of a BD-ROM in accordancewith another exemplary embodiment of the present invention;

[0061]FIG. 4d shows format of a linking area of a BD-ROM in accordancewith another exemplary embodiment of the present invention;

[0062]FIG. 5 shows new frame syncs defined in accordance with anexemplary embodiment of the present invention;

[0063]FIG. 6a shows the structure of a linking area to link physicalclusters formed on a BD-ROM and applicable frame syncs in accordancewith an exemplary embodiment of the present invention;

[0064]FIG. 6b illustrates frame syncs to be used for linking frames inaccordance with an exemplary embodiment of the present invention;

[0065]FIGS. 7a to 7 c show structures of each linking frame in a linkingarea and illustrate frame syncs written therein in accordance with anexemplary embodiment of the present invention;

[0066]FIG. 7d is an exemplary conversion table of 17 PP modulation;

[0067]FIG. 8 is a flow diagram to reproduce each linking frame inaccordance with an exemplary embodiment of the present invention;

[0068]FIG. 9 is a simplified block diagram of a player to play arecording medium in accordance with an exemplary embodiment of thepresent invention;

[0069]FIGS. 10a to 10 c show ways to write a physical address in alinking area in accordance with an exemplary embodiment of the presentinvention;

[0070]FIG. 11a is a block diagram of an exemplary linking frameconstructing circuit to create a linking frame with input user data asshown in FIG. 4a;

[0071]FIG. 11b is a block diagram of an exemplary linking frameconstructing circuit to create a linking frame with input user data asshown in FIG. 4d;

[0072]FIG. 12a shows an exemplary physical address allocated in thelinking frame shown in FIG. 4b;

[0073]FIG. 12b is an exemplary block diagram of a scrambler to scrambleuser data into the linking frame shown in FIG. 12a;

[0074]FIG. 13 is an exemplary block diagram of a scrambler to scrambleuser data into the linking frame shown in FIG. 4c;

[0075]FIGS. 14a to 14 c illustrate exemplary user data spaces of linkingframes where user data of arbitrary values are written;

[0076]FIG. 15a shows an exemplary of the present invention to write userdata in error recoverable format in a user data space of a linking frameshown in FIG. 4d;

[0077]FIG. 15b shows an exemplary data recording case in the ECC formatin the exemplary embodiment of FIG. 15a;

[0078]FIG. 15c shows an exemplary small-sized useful data recording casein the ECC format in the exemplary embodiment of FIG. 15a; and

[0079]FIG. 16 shows another way to write user data in error recoverableformat in a user data space of a linking frame according to an exemplaryembodiment of the present invention.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

[0080] In order that the invention may be fully understood, exemplaryembodiments thereof will now be described with reference to theaccompanying drawings.

[0081] First, a linking area of a high-density recording mediumstructured in accordance with exemplary embodiments of the presentinvention and data recording techniques related to the linking area inaccordance with exemplary embodiments of the present invention, namely,data forming techniques are explained in more detail.

[0082] Hereinafter, the terms of ‘write’, ‘record’ and ‘form’ are usedto represent same meaning for a read-only recording medium, such as aread-only medium. A frame formed in the linking area may also bereferred to as a linking frame or recording frame.

[0083] (1) Structure of a linking area

[0084] A recording medium, such as a high-density and/or read-onlyrecording medium, e.g., a BD-ROM structured in accordance with anexemplary embodiment of the present invention may have a physical formatcomposed of a Run-in area, a physical cluster, a Run-out area, and guardareas such as those described with reference to FIGS. 1 and 2 for ahigh-density, rewritable recording medium.

[0085] The Run-in area in accordance with an exemplary embodiment of thepresent invention may be, as shown in FIG. 3a, composed of a guard‘Guard_(—)1’ and a preamble ‘PrA’ that includes two sync data. Each syncdata may include 24-bit sync body and 6-bit sync ID.

[0086] While sync IDs of sync data in a preamble of a BD-RE may be ‘000100’ and ‘010 000’ as shown in FIG. 2a, the preamble of a BD-ROMstructured in accordance with exemplary embodiments of the presentinvention may include two sync data whose IDs are FS0(‘000 001’)(Sync_(—)3) and FS6(‘010 000’) (Sync_(—)2). The sync data ‘Sync_(—)3’may be placed ahead of the sync data ‘Sync_(—)2’.

[0087] In addition, the post-amble ‘PoA’ in the Run-out area of a BD-ROMstructured in accordance with exemplary embodiments of the presentinvention, as shown in FIG. 3b, may include sync data whose ID isFS4(‘000 100’) (Sync_(—)1). This is different from a BD-RE in that syncdata with sync ID of FS0(‘000 001’) is written in the post-amble of aBD-RE.

[0088] In the case of a BD-RE, if two RUBs are created, a pair of Run-inand Run-out areas are formed, as illustrated in FIG. 1c. The pair ofRun-in and Run-out areas (that correspond to a linking area) includethree sync data whose recording order is ‘Sync_(—)1’, ‘Sync_(—)2’ and‘Sync_(—)3’. The recording order of the BD-ROM may be ‘Sync_(—)3’,‘Sync_(—)2’ and ‘Sync_(—)1’ which is in a reverse order of the BD-RE.

[0089] Consequently, although the BD-ROM structured in accordance withexemplary embodiments of the present invention is similar to or the sameas, in physical recording format, to a BD-RE, the BD-ROM can bedistinguished from a BD-RE because of different sync data writing orderin a linking area. In addition, whether or not a current area is alinking area of a BD-ROM may be determined based on the arrangement ofthe sync data.

[0090] In the above exemplary embodiment, the Run-in, Run-out and theguard ‘Guard_(—)3’ areas may include information similar to thecorresponding recorded areas of a BD-RE.

[0091] Another exemplary linking area for a BD-ROM is shown in FIG. 4a.As shown in FIG. 4a, in an exemplary embodiment of a BD-ROM, two linkingframes of the same size (1932 channels bits) may constitute a singlelinking area. In contrast, for a BD-RE, a 1104-bit Run-in and 2760-bitRun-out area may be provided, which are different in size, but alsoconstitute a single linking area.

[0092] The two linking frames may be of the same structure and eachframe may be composed of a 30-channel-bit frame sync, a 9-byte physicaladdress, a 114-byte user data, and a 32-byte parity.

[0093] The 114-byte user data may include a variety of additionalinformation, e.g., anti-piracy information that makes it more difficultor impossible to illegally copy contents, such as a movie recorded on aBD-ROM to another medium, or control information usable for aservo-control operation.

[0094]FIG. 4b illustrates another exemplary embodiment of the presentinvention. The linking area in this exemplary embodiment may be composedof two equal-sized (1932 channel bits) linking frames and each frame maybe composed of a 30-channel-bit frame sync, a 9-byte physical address, a146-byte user data. Compared with FIG. 4a, the exemplary embodiment ofFIG. 4b has no parity.

[0095] Useful information can be written in the 146-byte user dataspace. The useful information may include anti-piracy information thatmakes it more difficult or impossible to illegally copy contents such asa movie recorded on a BD-ROM to another medium, or control informationusable for a servo-control operation.

[0096]FIG. 4c illustrates another exemplary embodiment of the presentinvention. The linking area in this exemplary embodiment may be composedof two equal-sized (1932 channel bits) linking frames. Each frame may becomposed of a 30-channel-bit frame sync and 155-byte user data. Comparedwith FIG. 4a, the exemplary embodiment of FIG. 4c has no physicaladdress and no parity. This exemplary embodiment is also different fromthat of FIG. 4b in that it has no physical address.

[0097]FIG. 4d illustrates another exemplary embodiment of the presentinvention. The linking area in this exemplary embodiment may be composedof a 30-channel-bit leading frame sync, a 3714-channel-bit linking part,two 30-channel-bit rear syncs, and two repetition patterns that are 40and 20 channel bits long, respectively. The 3714-channel-bit linkingpart may be composed of three linking frames and 4-bit dummy data.

[0098] Although FIGS. 4a-4 d illustrate exemplary embodiments of linkingareas, any other arrangement could also be utilized as would be known toone of ordinary skill in the art based on the structures described above

[0099] Data may be written in the form of ECC block in the physicalcluster and the aforementioned seven frame syncs FS0˜FS6 may be used inan ECC block in general.

[0100] In an exemplary embodiment of the present invention, at least onelinking frame of the two shown in FIG. 4a-4 d may use a new frame sync‘FS n’ that is different in sync ID from the seven frame syncs used forBD-RE. Examples of the sync ID of the new frame sync ‘FS n’ are ‘100101’(FS7), ‘101 010’(FS8), ‘010 101’(FS9), or ‘101 001’(FS10), as shownin FIG. 5.

[0101] All of the four exemplary sync candidates satisfy a constraintthat a transition shift, which is specified for a BD-RE, is not shorterin bit pattern than 2 bits.

[0102] In the exemplary embodiment of FIG. 4a, the frame sync FS0 iswritten in the first linking frame and the frame sync ‘FS n’ in thesecond.

[0103] Data recorded onto a BD-ROM must satisfy ‘Prohibit RMTR(Run-Limited TRansition)’ constraint of 17 PP (Parity Preserve)modulation code, which is the data recording standard defined for aBD-RE.

[0104] The Prohibit RMTR constraint, which ensures stable detection ofan RF signal, states that a minimum run length 2T, namely, ‘01’ or ‘10’must not be repeated continuously more than six times. Therefore, aframe sync with a smaller transition frequency may be used, namely, ‘100101’(FS7) or ‘101 001’(FS10) among the new frame syncs to makesuccessive bit trains satisfy the Prohibit RMTR constraint. The usage offrame syncs is explained in more detail with reference to FIGS. 6a-6 b.

[0105] The first case illustrated in FIG. 6b is the exemplary embodimentof FIGS. 3A and 3B. In this exemplary embodiment, two 1932-channel-bitrecording frames are recorded in a linking area and each recording frameis composed of a frame sync, a physical address, user data, and parity.At least one of the two recording frames may include the newly-definedframe sync ‘FS n’.

[0106] For instance, the frame sync ‘FS0’ with its identifying pattern(ID) ‘000 001’ may be written as the first frame sync while the newframe sync ‘FS n’, whose sync identifying pattern is ‘010 101’, 101010’, ‘100 101’, or ‘101 001’ is written in the second.

[0107] In the event that the new frame sync ‘FS n’ whose syncidentifying pattern is ‘010 101’, ‘101 010’, ‘100 101’or ‘101 001’ isused, the 9-byte physical address following the frame sync ‘FS n’ has anunscrambled starting data ‘00’ as illustrated in FIG. 6a. This isbecause it may be advantageous to satisfy the RMTR constraint of 17 PPmodulation codes defined for data recording on a BD-RE.

[0108] For example, if the new frame sync FS7 with sync identifyingpattern of ‘100 101’ is used and, at the same time, the following userdata bits are “01 11 01 11” whose modulated bits by 17 PP modulationtable given in FIG. 7d are “010 101 010 101”, the final modulated bitsincluding the sync identifying pattern constitute “100 101 010 101 010101” where a 2 T pattern, the pattern of one zero between neighboringtwo ones, occurs seven times continuously.

[0109] However, if user data includes ‘00’ at its head, the above userdata example becomes “00 01 11 01 11” whose 17 PP modulated bit train is“010 100 101 010 101”. Therefore, the final bits with the syncidentifying pattern constitute “100 101 010 100 101 010 101” where three2 T patterns, a 3 T and four 2 T patterns occurs sequentially.

[0110] A second case illustrated in FIG. 6b is the exemplary embodimentof FIG. 4A. In this exemplary embodiment, two 1932-channel-bit recordingframes may be recorded in a linking area and each recording frame may becomposed of a frame sync, a physical address, user data, and parity. Atleast one of the two recording frames includes the frame sync FS0(‘000001’)and another one of the newly-defined frame syncs ‘FS n’.

[0111] For instance, the frame sync FS0 with its identifying pattern 000001′ is written as the first frame sync while the new frame sync FS10whose sync identifying pattern is ‘101 001’ is written in the second.

[0112] In the event that the new frame sync ‘FS10’ is used, the RMTRconstraint of 17 PP modulation codes defined for data recording on aBD-RE is automatically satisfied. Consequently, the following physicaladdress need not be started with ‘00’.

[0113] For example, if the new frame sync ‘FS10’ with sync identifyingpattern of ‘101 001’ is used and, the following user data bits are “0111 01 11” whose modulated bits by 17 PP modulation table given in FIG.7d are “010 101 010 101”, the final modulated bit train with the syncidentifying pattern constitutes “101 001 010 101 010 101” where one 2 T,one 3 T and six 2 T patterns arise.

[0114] A third case illustrated in FIG. 6b is the exemplary embodimentof FIG. 4B. In this exemplary embodiment, two 1932-channel-bit recordingframes may be recorded in a linking area and each recording frame may becomposed of a frame sync, a physical address, user data, and parity.Both recording frames may include the newly-defined frame sync ‘FS n’.

[0115] For instance, both the first and the second frame syncs use oneof the new frame syncs, such as, FS7(‘010 101’), FS8(‘101 010’), orFS9(‘100 101’).

[0116] In the event that the new frame sync FS7, FS8 or FS9 is used, aphysical address of 9 bytes following the frame sync FS7, FS8 or FS9 hasan unscrambled starting data ‘00’ as illustrated in FIG. 6a. Asdescribed above, this is to better satisfy the RMTR constraint of 17 PPmodulation codes defined for data recording on a BD-RE.

[0117] In case that the new frame sync FS7(‘100 101’) is used, the RMTRconstraint can be satisfied by writing user data space following theframe sync having data other than “01 1101 11”.

[0118] A fourth case illustrated in FIG. 6b is the exemplary embodimentof FIG. 4C. In this exemplary embodiment, two 1932-channel-bit recordingframes may be recorded in a linking area and each recording frame may becomposed of a frame sync, a physical address, user data, and parity.Both recording frames may include the new frame sync FS10(‘101 001’, asan example.

[0119] In the event that the new frame sync ‘FS10’ is used for both dataframes, the RMTR constraint of 17 PP modulation codes defined for datarecording on a BD-RE is automatically satisfied. Consequently, thephysical address following each frame sync need not be started with bits‘00’.

[0120] If the newly-defined frame sync ‘FS n’ is used as explainedabove, whether a current area is within a linking area or not isdetermined more easily and more accurately because the new frame sync isdifferent from those used in a physical cluster.

[0121] For example, in case that a frame sync combination is used todetermine a current area, because a frame sync combination made from ‘FSn’ written in a linking area and FS4, FS4, and FS2 written respectivelyin the 29th to the 31st recording frames (Recording Frames #28 to #30)within a previous physical cluster becomes FSn-FS4 or FSn-FS2, which isdifferent from a combination made from frame syncs written in a physicalcluster, whether a current area may be within a linking area isdetermined accurately based on the frame sync combination.

[0122] The above explained several exemplary embodiments may besummarized as follows.

[0123] If adequate constraint is imposed on data to be written justafter a frame sync, any of the four new frame syncs can be used in anycombination.

[0124] For instance, if a physical address is written behind a framesync, if the physical address always has a header of bits ‘00’ the framesyncs FS8 and FS9 can be used.

[0125] Even if a physical address is not written, if a certain byte,e.g., ‘08h’(0000 1000) is written without being scrambled just behind aframe sync, a bit train “000 100 100 100” modulated from ‘08h’ by the 17PP modulation is placed after a frame sync, so that any of the four newframe syncs FS7-FS10 can be used irrespective of the RMTR constraint.

[0126] Frame syncs, such as one of the four new frame syncs FS7-FS10,may be written in a linking frame while one of the already-known framesyncs FS0-FS6 is in the other linking frame. The new frame syncs can beused in both of linking frames as shown in the cases 3 and 4 of FIG. 6.

[0127] If at least one new frame sync ‘FS n’ is used in a linking frame,a disc player, that includes an optical pickup 11, a VDP system 12, anda D/A converter 13 as depicted in FIG. 9, can detect whether acurrently-read frame is within a linking area or a data section(physical cluster) while reproducing recorded data from a BD-ROM.

[0128] In case of a BD-RE, 31 recording frames individually include oneof seven different frame syncs. However, seven frame syncs may not beenough to define 31 recording frames uniquely, so that a frame sync inthe previous recording frame or frames is used to identify a currentrecording frame along with a frame sync in the current frame.

[0129] In other words, a recording frame N can be identified bysuccessive syncs of its own frame sync and the frame sync in theprevious recording frames N−1, N−2, and/or N−3. That is, although one ortwo previous syncs N−1 and/or N−2 are not detected, the last-detectedsync N−3 can be used to identify the recording frame N along with itssync.

[0130] For instance, if a current recording frame is the seventh,namely, recording frame #6, its frame sync is FS1 as shown in FIG. 1d.

[0131] However, the frame sync FS1 is also written in the frames #1,#23, and #24, so that previously-detected frame sync is used to identifythe current frame. The currently-detected frame sync FS1 and thepreviously-detected frame sync or syncs FS4, FS1, and/or FS3, which arerespectively in the frames #5, #4, and #3, enable the current frame tobe identified.

[0132] Because an arrangement of frame syncs may be used to identify adata frame as explained above, frame sync sequence from previous dataframe to a recording frame within a linking area using the newly-definedframe sync can be accomplished. This is explained in more detail withreference to FIGS. 7a to 7 c.

[0133]FIGS. 7a to 7 c show applicable frame sync sequences in accordancewith exemplary embodiments of the present invention.

[0134]FIG. 7a is an example for the first case shown in FIGS. 6a and 6 band FIGS. 7b and 7 c are examples for a sync pair of FS7-FS7 and FS7-FS8of the third case shown in FIG. 6b, respectively.

[0135] If frame syncs of FS0 and FS7 are used as given in FIG. 7a, theframe syncs of frames N, N−1, and N−3 before the frame #0 with framesync FS0 are FS7, FS0 and FS2 sequentially as case (1) shows. This frame#0 corresponds to the first address unit of RUB. As the case (2) shows,three frames before the frame #0 at the second row have frame syncs ofFS2, FS4 and FS4, sequentially. This frame #0 correspond to the middleaddress unit of RUB. As the case (3) shows, three frames before theframe #1 have frame sync sequence of FS0, FS7/FS2 and FS4, so that thisframe #1 corresponds to the first address unit or the middle unit ofRUB. In addition, the three frames before the frame #2 are FS1, FS0 andFS7/FS2 sequentially in their frame syncs as the case (4) shows, so thatthis frame #2 corresponds to the first or the middle unit of RUB.

[0136] As depicted by the ‘A’-marked case of FIG. 7a, both the frame #0corresponding to the middle address unit of RUB and the frame #31 (thefirst linking frame) in accordance with exemplary embodiments of thepresent invention have the same frame sync sequence of previous frames.Therefore, it may be difficult to detect a start of a linking area, andthe adoption of the pair of FS0 and FS7 may not be ideal.

[0137] Using only FS7 is shown in FIG. 7b. As shown in the case (1) ofFIG. 7b, the frame sync sequence before the frame #0 is FS7/FS2, FS7/FS4and FS2/FS4 and the frame #0 is the first address unit or the middleunit of RUB. As the case (2) shows, the frame sync sequence before theframe #1 is FS0, FS7/FS2 and FS7/FS4 and the frame #1 is the first orthe middle unit of RUB. In addition, as the case (3) shows, the framesync sequence before the frame #2 is FS 1, FS0 and FS2 and the frame #2is also the first or the middle unit of RUB.

[0138] However, as depicted in the ‘B’-marked case of FIG. 7b, the firstlinking frame (frame #31) and the second linking frame (frame #32),which are in accordance with exemplary embodiments of the presentinvention, have the same frame sync sequence at frames N and N−3, whichcould cause a problem in defining a linking area. However, because thetwo linking frames have the newly-defined frame sync FS7, this case ofFS7-FS7 would make it easier to detect a linking area, than the case ofFS0-FS7 of FIG. 7a.

[0139]FIG. 7c shows the case where FS7 and FS8 are used. As the case (1)shows, the frame sync sequence ahead of the frame #0 is FS8/FS2, FS7/FS4and FS2/FS4 and the frame #0 is the first or the middle address unit ofRUB. As the case (2) shows, the frame sync sequence before the frame #1is FS0, FS8/FS2 and FS7/FS4 and the frame #1 is the first or the middleunit of RUB.

[0140] In addition, as the case (3) shows, the frame sync sequence aheadof the frame #2 is FS1, FS0 and FS7/FS2 and the frame #2 is also thefirst and the middle unit of RUB.

[0141] As shown in FIG. 7c, the use of FS7 and FS8 dose not reveal sameprevious frame sync sequence before any frame, namely, the previousframe sync sequence before any frame is unique, therefore, there is noproblem in detecting a linking area.

[0142] Consequently, the use of FS7 and FS8 is a well selected pair fora linking area structured in accordance with exemplary embodiments ofthe present invention. In addition, the frame syncs FS7 and FS8 satisfyRMTR constraint as explained above. Although in this exemplaryembodiment, FS7 and FS8 are selected to identify the linking area and/orsatisfy the RMTR constraint, any other combination could also be used,as would be known by one of ordinary skill in the art.

[0143]FIG. 8 is a flow diagram of an exemplary embodiment of a method toreproduce a recording medium structured in accordance with exemplaryembodiments of the present invention.

[0144] If a BD-ROM containing a linking area structured in accordancewith exemplary embodiments of the present invention is loaded (S81),management information for reproducing control written in the BD-ROM isread into a memory (S82). If the management information has been writtenin a lead-in area, it may be read out at an initial preparing stage byan optical pickup. Reproduction of main data is started under control ofa controlling unit (S83). During reproduction, a frame sync is detected(S84). If detected, a determination is made whether or not the detectedsync is one of the syncs written in the main data area (S85). Thisdetermination is possible if a disc recording/reproducing device havingsyncs FS0˜FS8 stored therein compares the detected sync with the storedsyncs.

[0145] If it is determined that the detected sync is one of syncs(FS0˜FS6) written in the main data area (S86), reproduction continues.However, if it is determined that the detected sync does not pertain toone of syncs (FS0˜FS6), which means that it is a newly-defined sync FS7or FS8, a current location is regarded a linking area (S87) and then itis determined whether the area is within the first linking frame orwithin the second (S88). If within the first linking frame, datafollowing its frame sync is descrambled (S89). Otherwise, the currentlocation is regarded as the second linking frame and data just after itsframe sync is descrambled (S90).

[0146] Therefore, a disc player, that includes an optical pickup 11, aVDP system 12, and a D/A converter 13 as depicted in FIG. 9, can moreaccurately detect a physical address and user data within the first andthe second linking frame (Recording Frames #k+1, #k+2) of a BD-ROM whenit is placed therein. More particularly, if the user data containsuseful information for anti-piracy or servo-control, the disc player canconduct an operation to use the useful information.

[0147] As explained above, whether a current location, which an opticalpickup is on, is within a linking area or main data area can bedetermined more easily and/or more quickly by detecting and comparing anewly-defined frame sync.

[0148] (2) Physical Address

[0149] In the linking frame structure shown in FIG. 4a, there are atleast three alternatives for writing a physical address in eachrecording frame of a linking area as shown in FIG. 10a. A firstalternative writes in both linking frames an AUN of a physical cluster#k+1 closest behind the frames, and a second alternative writes an AUNof a physical cluster #k closest before the frames.

[0150] In the third alternative, an AUN of a physical cluster #k closetbefore the first linking frame is written in the first while an AUN of aphysical cluster #k+1 closest behind the second linking frame is writtenin the second.

[0151] The physical address, composed of 4-byte address, 1-byte reservedand 4-byte parity as shown in FIG. 11a, may be encoded to have errorrecovery capability by RS(9,5,5) that is used for a BD-RE. Theprocessing to make an address have error recovery capability will bedescribed in more detail below.

[0152] A disc player, that includes an optical pickup 11, a VDP system12, and a D/A converter 13 as depicted in FIG. 9, can more accuratelydetect a physical address and user data within the first and the secondlinking frame (Recording Frames #k+1, #k+2) of a BD-ROM when it isplaced therein. More particularly, if the user data contains usefulinformation for anti-piracy or servo-control, the disc player canconduct an operation to use the useful information.

[0153] In the linking frame structure shown in FIG. 4d, there are atleast two alternatives for writing a physical address in each of threerecording frames of a linking area as shown in FIG. 10b. A firstalternative writes in three linking frames an AUN of a physical cluster#k+1 closest behind the frames, and a second alternative writes an AUNof a physical cluster #k closest before the frames.

[0154] The physical address, composed of 4-byte address, 1-byte reservedand 4-byte parity as shown in FIG. 11a, may be encoded to have errorrecovery capability by RS(9,5,5) that is used for a BD-RE. Theprocessing to make a physical address have error recovery capabilitywill be described in more detail below.

[0155] A disc player, that includes an optical pickup 11, a VDP system12, and a D/A converter 13 as depicted in FIG. 9, can more accuratelydetect a physical address and user data within the successive threelinking frames (Recording Frames #k+1, #k+2, #k+3) of a BD-ROM when itis placed therein. More particularly, if the user data contains usefulinformation for anti-piracy or servo-control, the disc player canconduct an operation to use the useful information.

[0156]FIG. 10c shows another exemplary embodiment of the presentinvention that writes an address in a recording frame. Each of thelinking frames (Recording Frames #k+1, #k+2) contains a 9-byte physicaladdress where 4-byte actual address is included. The 4-byte actualaddress may have same value with 16 AUNs #0#15 written in a physicalcluster before or behind the linking frames.

[0157] A 4-byte actual address written in a physical cluster before thefirst linking frame may be composed of a 27-bit address, a 4-bitsequence number (0000˜1111) indicative of its order in physicaladdresses and 1-bit fixed value ‘0’, as shown in FIG. 10c. All of the27-bit addresses written in the leading physical cluster may have thesame value.

[0158] Another 4-byte actual address written in a physical clusterbehind the second linking frame may be composed of a 27-bit address, a4-bit sequence number (0000˜1111) indicative of its order in physicaladdresses and 1-bit fixed value ‘0’, as shown in FIG. 10c. All of the27-bit addresses written in the following physical cluster may have thesame value.

[0159] As previously mentioned, the 4-byte actual address of the firstlinking frame includes an address written in the physical addresslocated therebefore. For example, the 4-byte actual address of the firstlinking frame has the address value of the closest 16-th AUN (AUN #15)of 27-bit and ‘11110’, as shown in FIG. 10c. In this case, the last1-bit ‘0’ of the five bits ‘11110’to be written in the first linkingframe can be replaced with ‘1’ in order to indicate that a physicaladdress is written in a linking area other than a physical cluster.

[0160] In addition, the 4-byte actual address of the second linkingframe may include an address written in the physical address locatedthereafter. For example, the 4-byte actual address of the second linkingframe has the address value of the closest first AUN (AUN #0) of 27-bitand ‘00000’, as shown in FIG. 10c. In this case, the last 1-bit ‘0’ ofthe five bits ‘00000’ to be written in the second linking frame can bereplaced with ‘1’ in order to indicate that a physical address iswritten in a linking area other than a physical cluster.

[0161] The final five bits of the 4-byte actual address to be written inthe first linking frame may be ‘00000’ while the final five bits to bewritten in the second linking frame may be ‘11110’, although thesevalues are merely exemplary.

[0162] In addition, an address written in an arbitrary physical clusteramong physical clusters located before or after a linking area can bewritten in the first and the second linking frame as explained abovewith reference to FIG. 10c.

[0163] (3) Scrambling

[0164]FIG. 11a is a block diagram of an exemplary linking frameconstructing circuit for the structure shown in FIG. 4a. The linkingframe constructing circuitry may comprise a scrambler 10 and an adder20. The scrambler 10 scrambles 114-byte user data with 9-byte physicaladdress to make its DSV (Digital Sum Value) close to zero and adds the9-byte physical address before the scrambled user data.

[0165] The adder 20 adds 32-byte parity behind the address-added userdata from the scrambler 10 as well as a 20-channel-bit frame sync aheadof the address-added user data. Consequently, a complete recording frameincluding 114-byte user data scrambled with a 9-byte physical addresscan be constructed.

[0166] In the scrambling of user data, information other than a 9-bytephysical address can also be used.

[0167]FIG. 11b is a block diagram of another exemplary linking frameconstructing circuit for the structure shown in FIG. 4d. This linkingframe constructing circuitry includes a scrambler 10′ and an adder 20′.The scrambler 10′ scrambles 62-byte user data such as anti-piracyinformation with a 9-byte physical address to make its DSV (Digital SumValue) close to zero and adds the 9-byte physical address before thescrambled user data.

[0168] The adder 20′ adds 32-byte parity behind the address-added userdata from the scrambler 10′. Consequently, a complete 103-byte recordingframe including 62-byte user data scrambled with a 9-byte physicaladdress can be constructed.

[0169] In the scrambling of user data, information other than a 9-bytephysical address can also be used.

[0170] Instead of constructing a linking frame including a frame sync,9-byte physical address, 114-byte user data, and 32-byte parity as shownin FIG. 4a, a linking frame may be constructed to have a frame sync,9-byte physical address including 1-byte reserved and 4-byte parity, and146-byte user data as shown in FIG. 4b or 12 a. The 146-byte user datamay be scrambled and the 4-byte actual physical address may be used as ascrambling key.

[0171] That is, a part of 32 bits (Add 0˜Add 31) of the 4-byte physicaladdress may be used as an initial loading value of a 16-bit shiftregister 101 in the scrambling circuitry, as shown in FIG. 12b. Afterthe initial loading value is loaded in parallel into the shift register101, one scrambling byte is outputted every bit shift.

[0172] Because the user data is 146-byte in length in the exemplaryembodiment of FIG. 9, part of physical address is loaded in parallelinto the shift register 101 every 146 shifts. The partial address to beloaded changes as a linking area does. After the parallel loading, 146scrambling bytes (S0˜S145) are created and OR-ed exclusively withsuccessive 146 bytes (D0˜D145) of user data by an exclusive-OR gate 102,sequentially. The successive 146 bytes scrambled as before are writtenin a linking frame.

[0173] Instead of a physical address, a part of frame sync pattern orsome repetitions of bits ‘10’ can be used as a scrambling key toscramble user data. Moreover, instead of a physical address to bewritten in a linking frame, one address among 16 addresses included in aphysical cluster before or behind a current linking frame may also beused, especially, an address closest to a current linking frame can beused among the 16 addresses.

[0174] A physical address to be written in a linking frame may bescrambled along with user data written therein.

[0175] In another exemplary embodiment of the present invention, aphysical address may not be written in a linking frame as shown in FIG.4c. In this case, a physical address before or behind a linking frame isused as a scrambling key, namely, an initial loading value to the shiftregister. Because user data is 155 bytes long in this exemplaryembodiment, the same or different physical address is loaded as aninitial value into the shift register every 155 shifts.

[0176] As shown in FIG. 13, a part of the 4-byte address (Add #0˜#31) isloaded in parallel into a 16-bit shift register 101′ of a scrambler thatis also applicable to a BD-RE recording and then 155 8-bit scramblingbytes (S0˜S154) are outputted sequentially during the process ofbit-shifts.

[0177] The successive 155 scrambling bytes (S0˜S154) can beexclusive-ORed with successive 155 user bytes (D0˜D154) by anexclusive-OR gate 102′. As a result, 155 scrambled user data (D0˜D154)are produced and they are written in a recording frame in a linkingarea.

[0178] Instead of a physical address, a part of frame sync pattern orsome repetitions of bits ‘10’ can be used as a scrambling key toscramble user data.

[0179] (4) Dummy Data

[0180] In case that useful data for anti-piracy or servo-control is notwritten in the user data space, although two recording frames are formedin a linking area of a BD-ROM to ensure reproducing compatibility with aBD-RE, the user data space may be filled with an arbitrary value, e.g.,‘00h’ as shown in FIG. 14a. A series of such a filling value is calleddummy data.

[0181] If the same data was filled in the entire user data spaces, themanufacturing process of a BD-ROM could be simplified. Further, ifadjacent tracks had the same bit patterns crosstalk could arise. Thus,another exemplary embodiment of dummy data, several values, e.g., ‘00h’,‘01h’, ‘10h’, ‘11h’, ‘FFh’, ‘AAh’, etc. are written in user data spacesin turn, as illustrated in FIG. 14b in order to reduce the probabilityof crosstalk.

[0182] In this exemplary embodiment of dummy data recording, dummy dataof different values are recorded in the recording frames of each linkingframe allocated in a BD-ROM, which reduces the probability that the samerecording patterns are formed between neighboring tracks. Consequently,the crosstalk probability is reduced.

[0183] If two recording frames are formed in a linking area of a BD-ROMto ensure reproducing compatibility with a BD-RE, in another exemplaryembodiment according to the present invention, the user data space maybe filled with several, arbitrary different values, e.g., ‘00’, ‘01’,‘11’ which appear alternately as shown in FIG. 14c.

[0184] In the exemplary dummy data recording embodiment of FIG. 14c, alinking area has the same data in its user data spaces while neighboringlinking areas have different dummy data.

[0185] In this exemplary embodiment, the probability that the samerecording patterns are formed between neighboring tracks is lower,therefore, the crosstalk probability is reduced. The manufacturingprocess of a BD-ROM of this exemplary embodiment is also simpler.

[0186] In addition, if one value, e.g., ‘00h’ fills entire user dataspaces after being scrambled with a physical address that changes everylinking area, crosstalk can also be reduced.

[0187] If ‘00h’ fills the user data spaces after scrambling, if anon-scrambled ‘08h’ is placed at the foremost front of each user dataspace, any of the aforementioned new frame syncs can be usedirrespective of the RMTR constraint specified in 17 PP modulation asexplained above.

[0188] (5) Construction of ECC Block

[0189] If useful and important information is written in the user dataspace, this information may be channel-encoded to ensure itsreliability. RS(62,30,33) and RS(248,216,33) encoding system areexemplary channel encoding systems that may be used. These encodingsystems may also be specified to be used to encode user data to bewritten in physical clusters of a BD-ROM.

[0190]FIG. 15a shows a recording example in which data is recorded in alinking area structured as shown in FIG. 4d. For recording useful dataas illustrated in FIG. 15a, 30-byte useful data may be encoded first byRS(62,30,33) system, which creates 32-byte parity.

[0191] For this operation, input data may be sequentially stored in amemory to organize a 30×309 data block. When a 30×309 data block isorganized, every column is sequentially scanned (151). A 32-byte parityis produced by the RS(62,30,33) encoding system every one scan of thecolumn and it is appended thereto. As a result, a 62-byte data series isconstructed.

[0192] Each 62 bytes including the parity may be scrambled. In case ofscrambling, a part of a physical address may be used as a scrambling keyas explained above.

[0193] A 9-byte physical address may be added in front of the 62 bytesproduced from the above process. The 9-byte physical address may becomposed of an actual physical address and parity thereof. For instance,The 9-byte physical address may be composed of a 4-byte actual address,1-byte reserved, and a 4-byte parity.

[0194] 145-byte dummy data may be added to the 71 bytes including thephysical address and then encoded by RS(248,216,33) system; as a result,32-byte parity is added. The added 145 dummy bytes may then be removedto produce a 103-byte data unit to be written in a linking area.

[0195] The above-explained operations are then repeated for the next30-byte useful data to produce successive 103-byte data units. Afterthree units are produced, 4 dummy bits may be added behind the threeunits and the total 2467 bits are then 17 PP-modulated. After 17PP-modulation, the 2467 bits can be extended to 3714 channel bits. Thefirst frame sync of 30 channel bits is placed in front of the modulated3714 bits, and the second 30-channel-bit frame sync, a 40-channel-bitrepeated bit pattern, the third 30-channel-bit frame sync, and another20-channel-bit repeated bit pattern are sequentially appended to themodulated bits. The thusly-made 3864 channel bits may then be written ina linking area.

[0196] If useful data is large not enough to fill a single linking areaas above, dummy data is added to a segment of useful data to constitute30 bytes. For instance, if 3-byte useful data is to be written perlinking area, one byte of the three should constitute a single dataunit. Therefore, as shown in FIG. 15c, only one 309-byte row is filledin a 30×309 data block and other 29 rows are all filled with dummy data.This means that 29-byte dummy data is added to 1-byte useful data atevery column. Afterwards, the RS(62,30,33) encoding system is applied toeach column of the dummy-added 30 bytes to append 32-byte paritythereto.

[0197] In order to restore useful data written in a linking area asbefore, a decoding process, namely, a reverse sequence of theabove-explained writing process, is conducted.

[0198] If two same frames constitute a single linking area asillustrated in FIG. 4b, the user data space of a linking frame may befilled with 114-byte useful data and 32-byte parity as shown in FIG. 4a.In the recording example of FIG. 4a, an alternate method from thedescribed in FIG. 4b or 4 c can be used in channel encoding to ensuredata reliability. The alternate method is explained with reference toFIG. 16.

[0199] Useful data is collected up to 2048 bytes (S1). 4-byte EDC (ErrorDetection Code) is appended to a useful data block composed of thecollected 2048 bytes (S2). The 2052 bytes including EDC is divided intoeighteen 114-byte data units (S3). The first data unit is scrambled (S4)and a 9-byte physical address is added therebefore (S5). The 93-bytedummy data is added to the 123-byte data unit including the physicaladdress and is encoded by the RS(248,216,33) system, whereby 32-byteparity is appended to the data unit. The added 93 bytes are removed toproduce 155-byte frame data (S6) which is then 17 PP-modulated. Finally,the aforementioned 30-channel-bit frame sync is added in front of theframe data to make a complete linking frame of 1932 channel bits (S7).

[0200] The above-explained sequential processes (S4-S7) are applied tothe next divided 114-byte data unit to make another linking frame. Thethusly-made two linking frames are written in a linking area; as aresult, the structure illustrated in FIG. 4a is formed.

[0201] When each 114-byte data unit is scrambled by the above processes,a physical address is used in scrambling as explained above. Same ordifferent physical address, which are written in a RUB located before orbehind a linking area, are used for the first and the second linkingframe of a linking area. If using different addresses, the first linkingframe uses an address written before a linking frame while the seconduses another address behind the linking frame.

[0202] The physical address to be written in each linking frame may becomposed of 4-byte actual address, 1-byte reserved, and 4-byte parity asmentioned above. In this case, the 4-byte parity is produced by applyingthe RS(9,5,5) channel coding system to the 5 bytes.

[0203] In addition, the 4-byte actual address is composed of 27-bitaddress and 5-bit address identifier that is used to distinguishindividual physical addresses in linking areas.

[0204] A pair of ‘00000/11110’or ‘00001/11111’ may be used as addressidentifier. In case of using the former (or the latter), ‘00000’ (or‘00001’) is inserted in a physical address in one linking frame while‘11110’ (or ‘11111’) is inserted in the other linking frame.

[0205] In the above explanation of the exemplary embodiments of thepresent invention, it was described that the new frame sync ‘FS n’,which is different from the syncs ‘FS0˜FS6’ for data frames written inphysical clusters, can be used for linking frames. In case of using thenew frame sync different from syncs of data frames, data to be writtenin physical clusters is encrypted with the frame sync in a linking framein order that digital contents recorded on a BD-ROM can be protectedagainst illegal copying.

[0206] Although contents with such encrypted data recorded on a BD-ROMare copied onto a rewritable disc, e.g., a BD-RE, the new frame sync ‘FSn’ in a linking frame need not be copied onto a BD-RE and it need not becreated during a BD-RE recording. That is, a key having been used inencryption is not obtainable during reproduction of copied contents on aBD-RE, so that it is impossible to decrypt. Consequently, contents on aBD-ROM can be protected against illegal copying.

[0207] The above-explained exemplary structures of a linking area of ahigh-density read-only recording medium according to the presentinvention helps ensures reproduction compatibility with a rewritablerecording medium such as a BD-RE when being reproduced by a disc playeror a disc drive. In addition, the exemplary structures of a linking areamakes it possible for a disc player or a disc drive to conductoperations to distinguish a read-only recording medium from a rewritableone quickly, if needed. Moreover, useful information can be reliablystored in a linking area through the above-explained exemplary recordingtechniques.

[0208] Although exemplary embodiments of the present invention have beendescribed in conjunction with a high-density, read-only recordingmedium, the teachings of the present invention are also applicable toother recording media, such as recordable, rewritable, or rewritableonce media and methods and apparatuses associated therewith, as would beknown to one of ordinary skill in the art.

[0209] Although certain specific embodiments of the present inventionhave been disclosed, it is noted that the present invention may beembodied in other forms without departing from the spirit or essentialcharacteristics thereof. The present embodiments are therefore to beconsidered in all respects as illustrative and not restrictive, thescope of the invention being indicated by the appended claims, and allchanges that come within the meaning and range of equivalency of theclaims are therefore intended to be embraced therein.

1. A recording medium, comprising: a data area including at least twodata sections; and a linking area to link neighboring data sections, thelinking area including at least two frame sync signals, where values ofthe at least two frame sync signals maintain uniqueness.
 2. Therecording medium of claim 1, wherein the linking area includes at leasttwo linking frames, a first linking frame and a second linking frame,wherein at least one frame sync signal is included in each linkingframe.
 3. The recording medium of claim 2, wherein each linking frameincludes at least one frame sync signal at a front of the linking frame.4. The recording medium of claim 1, wherein each frame synch signalincludes a frame synch number and a frame synch ID.
 5. The recordingmedium of claim 1, wherein the data area includes at least one syncsignal.
 6. The recording medium of claim 5, wherein the at least twoframe sync signals in the linking frames are different from the at leastone sync signal in the data area.
 7. The recording medium of claim 1,wherein said at least one frame sync signal is different from a syncsignal written on a rewritable or recordable recording medium duringdata recording.
 8. The recording medium of claim 5, wherein the at leastthree sync signals are different from each other and a recorded order ofthe at least three sync signals is reverse of a recorded order of atleast three sync signals written in a linking area of a rewritable orrecordable recording medium.
 9. The recording medium of claim 4, whereineach frame sync ID is one of ‘100 101’, ‘101 010’, ‘010 101’or ‘101001’.
 10. The recording medium of claim 9, wherein a frame sync signalwritten in a first linking frame is ‘100 101’ and a frame sync signalwritten in a second linking frame is ‘101 010’.
 11. The recording mediumof claim 10, wherein a value of ‘00’ follows the frame sync signal ofeach linking frame.
 12. The recording medium of claim 11, wherein aphysical address follows the value of ‘00’.
 13. The recording medium ofclaim 10, wherein a value of ‘08h’ follows the frame sync signal of eachlinking frame.
 14. The recording medium of claim 13, wherein a value of‘00h’ follows the value of ‘08h’ for a remainder of the linking frame.15. The recording medium of claim 1, wherein a signal distance betweenthe at least two frame sync signals maintains uniqueness.
 16. Therecording medium of claim 15, wherein the signal distance between the atleast two frame sync signals is at least two.
 17. The recording mediumof claim 1, wherein the at least two frame sync signals maintainuniqueness over n frames, where n≧2.
 18. The recording medium of claim17, wherein the at least two frame sync signals maintain uniqueness overn frames, where n≧4.
 19. A method of forming a recording medium,comprising: forming a linking area to link neighboring data sections ofa data area while recording data onto the recording medium; selectingvalues of at least two frame sync signals, to maintain uniqueness; andwriting the at least two frame sync signals in the linking area to linkthe neighboring data sections.
 20. A method of reproducing data from arecording medium, comprising: utilizing a linking area, including atleast two frame sync signals, which maintain uniqueness and linkneighboring data sections of a data area, to reproduce the data.
 21. Themethod of claim 20, further comprises, determining whether or not acurrent position is a linking area based on the at least one frame syncsignal.
 22. The method of claim 20, further comprises, determiningwhether a current position is a front or rear of the data section basedon the at least one frame sync signal.
 23. The method of claim 20,wherein the data section has at least seven different frame syncsignals, and two frame sync signals of linking area are different fromthe seven different sync signals of the data section.
 24. The method ofclaim 23, wherein one of the at least two frame sync signals is a framesync signal of bit pattern “100 101”, and another is a frame sync signalof bit pattern “101 010”.
 25. A method of recording data on a recordingmedium, comprising: utilizing a linking area, including at least twoframe sync signals, wherein the at least two frame sync signals maintainuniqueness and are different from a sync signal included in the dataarea, to record the data.
 26. The method of claim 25, wherein a datasection of data area has at least seven different frame sync signals,and the at least two frame sync signals of the linking area aredifferent from the seven different sync signals of the data section. 27.The method of claim 26, wherein one of the at least two frame syncsignals is a frame sync signal of bit pattern “100 101”, and another isa frame sync signal of bit pattern “101 010”.
 28. The method of claim27, wherein the first and second frame sync signals are recorded inorder between two data sections.
 29. An apparatus for reproducing datafrom a recording medium, said apparatus utilizing a linking area,including at least two frame sync signals, which maintain uniqueness andlink neighboring data sections of a data area, to reproduce the data.30. A recording medium, comprising: a data area of at least two datasections, and a linking area between the data sections, wherein thelinking area includes at least two linking frames, a first linking frameand a second linking frame which each include at lest one frame syncsignal, where each frame sync signals maintain uniqueness and isdifferent from a sync signal included in the data section.
 31. Therecording medium of claim 30, wherein a data section of the data areahas at least seven different frame sync signals, and the at least twoframe sync signals of the linking area are different from the sevendifferent sync signals of the data section.
 32. The method of claim 31,wherein one of the at least two frame sync signals is a frame syncsignal of bit pattern “100 101”, and another is second frame sync signalof bit pattern “101 010”.